Risk-phrase, sometimes abbreviated as R-phrase, refers to the labeling, via a phrase or sentence, of dangerous substances according to the risks they present. Dangerous substances can be classified according to the type of risk and each category has a code with an associated risk-phrase, a label with a standardised meaning in different languages.

The list of risk-phrases for the European Union (EU), which is also widely used outside Europe, is published in Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006.

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